Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fde631c4404a8c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8459585593f623fdef21a3f380b8c32 SHA-1: 57cef5f598a91b114b4a4871c9b3640a196ebbc9 SHA-256: a3fde631c4404a8cbcfac749f39cfbb35bee48484b804062e2aa629498712cfb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains embedded URLs, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of malformed streams and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/award?keyword=attachment+theory+bowlby+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5fcdaf08da03e.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/vusimutef.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_603e472aa691b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_60144e9e2d722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_602af88d48088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_60405e8f28165.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/egcjdYE/real_moto_2020_colby_raha.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fcd45617d32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_60418211c769d.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/what_is_the_best_antenna_for_a_cobra_29_ltd.pdfIn PDF document text
    • http://namunogetivij.iblogger.org/autocad_lt_2019_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/wukorovev/j9eic9M/chaitrada_chandrama_kannada_movie_song.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/62057727459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_605202a3dfe70.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/new_metro_map_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/2njfnih/behavior_intervention_plan_format.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/ap_tet_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_22f8e7d6045349909931c3ee0e9a252b.pdf?index=trueIn PDF document text
    • http://fupizud.rf.gd/dosupagasura.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_6777f3aac36d47879ff843903b15a73a.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9fa6c5bf99c04fdb815da04746dde2e8.pdf?index=trueIn PDF document text
    • http://gidubabe.myartsonline.com/ateneo_application_form.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_25572f84fb4043e48e8307c061d652eb.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_81d482e3f5074536a24c78769fd41249.pdf?index=trueIn PDF document text
    • http://zadosuwiwebuw.epizy.com/98975935485.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5280 bytes
SHA-256: 739c7d97a0708974841f961756dd21e65264e144bf107f255d9d33ed3a723c1a
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 12008 bytes
SHA-256: 18ad6243d8d69093799737db2796baedc9b0f24ab088287c58d9b035b0e9e7d1
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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